Hand fastener driving tool

ABSTRACT

A hand driving tool, such as a screwdriver, comprising a torque magnifying handle and a headed bit. The handle defines a longitudinal bore to recieve the head of the headed bit. The bore is specially configured to minimize mechanical binding forces and to eliminate suctional resistance to bit removal without requiring the perforation of the head end of the handle.

finite States Patent [191 Condon Aug. 14, 1973 HAND FASTENER DRIVINGTOOL [75] Inventor: Harry F. Condon, Hillsdale, Mich.

[73] Assignee: Vaco Products Company, Chicago,

[22] Filed: Feb. 22, 1972 [21] App]. No.: 227,880

Related US. Application Data [63] Continuation-impart of Ser. No.20,295, March 17,

1970, abandoned.

[52] US. Cl. 145/61 L, 81/177 G [51] Int. Cl. B25g 3/02 [58] Field ofSearch 81/177 A, 177 G,

81/177 N, 121 R; 145/50 R, 50 C, 61 R, 61 E, 61 L, 61 J; 279/9, 102;287/53 H; 292/347 [56] References Cited UNITED STATES PATENTS 1,632,2276/1927 Halsey 145/61 1,035,427 8/1912 Donoghue 145/61 R 2,063,41912/1936 Zongaro 279/102 X 2,725,086 11/1955 Keyes 145/61 L PrimaryExaminer-James L. Jones, Jr. m e?! aerM rkr B s. ,7 Attorney-MaxDressler, Marshall W. Sutker et a1.

[57] ABSTRACT A hand driving tool, such as a screwdriver, comprising atorque magnifying handle and a headed bit. The handle defines alongitudinal bore to recieve the head of the headed bit. The bore isspecially configured to minimize mechanical binding forces and toeliminate-suctional resistance to bit removal without requiring theperforation of the head end of the handle.

14 Claims, 9 Drawing Figures Patented Aug. 14, 1973 3,752,202

FIG,

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This application is a continuation-in-part of my copending U.S. Pat.application Ser. No. 20,295 which was filed on Mar. 17, I970 and nowabandoned.

This invention relates to a hand fastener driving tool, and inparticular to one comprising a handle adaptable interchangeably toreceive and removably retain a series of headed bits.

There are many interchangeable bit hand driving tools known to the handdriver art. In many such tools, metallic bits having speciallyconfigured ends remote from the bit ends are received in speciallyconfigured sockets in handles. Such bits are usually single purposebits, however they may be double headed bits reversibly insertable in aspecially configured handle. In that case the metallic bit itself isusually configured to be keyed within the handle. A typical example ofthe latter type of tool is illustrated in U.S. Pat. No. 3,455,355.

Another type of interchangeable bit hand driving tool which has recentlycome into vogue is one in which a.

longitudinally bored handle is provided,.the bore being adapted toreceive a series of headed bits, such as metallic bits. The end of thebit is embedded in a plastic head larger than the bit, which head issomewhat smaller than the usual driver handle. In such tools both theenlarged bore defining handle and the head of the headed bits are madeof suitable plastic materials.

Difficulties is using such tools and in removing the plastic head of theheaded bit from the plastic head receiving bore are frequentlyencountered. One attempt which has been made to reduce the difficultyencountered in removing the head from the bore has been to bore or molda passageway through the head end ofthe handle, which passagewayterminates in communication with the inner end of the bore in thehandle. Thishas not been entirely satisfactory and has presented thedistinct disadvantage of positioning an opening in the head end of thehandle which, when the palm of a user's hand is pressed thereagainst,tends to abrade the skin in use, and to cause blistering.

In accordance with this invention, a hand fastener driving toolincorporating a handle defining a specially configured bore forreceiving the head end of a headed bit is provided. This tool providesmeans for assuring easy removal of the head of the headed bit from thebore, without creating resistant suction forces and without thenecessity of providing an opening through the head end of the handle.

More particularly, the hand driving tool of this invention comprises anenlarged torque magnifying handle defining an elongate bore at one endand defining a smooth opposite end for engagement by a users hand. Thebore is configured complementarily to receive the head portion of aheaded bit, the headed bit comprising also a fastener engaging metallicbit member projecting from the head. The inner surface of the bore andthe outer surface of the head provide complementary surface portionswhich are of generally the same size and which are proportioned andshaped to prevent relative rotation therebetween. The outer surface ofthe head and the inner surface of the bore define between. them a slightspace which provides an air passage or air channel from the exterior ofthe handle to the inner-most end portion of the bore. In one embodimentof this invention, an opposed pair of head engaging pad means areprovided intermediate the ends of the handle bore,

the pad means being spaced apart sufficiently to frictionally engageopposed surfaces of the head thereby to frictionally retain the head ofthe headed bit within the bore, hence within the torque magnifyinghandle.

The handle may also desirably define a plurality of small stop memberswhich limit the distance which the head may be inserted into the boreand which prevent full seating of the rounded end of the bit headagainst the confronting concave surface in the bore. When these stopmembers are provided, the contact between the head and the confrontingsurfaces of the bore, is-

minimized. This prevents sweating and the like, which, particularly inhot and humid weather, tends to freeze portions of the head and thehandle to each other, resulting in resistance to removal of the headedbit from the handle. Further, to minimize the possibility of suctionforces resisting removal of the head, the inner end portion of the borefunctions as a suction relief chamber. This provides an enlarged volumeair space, which, if sealing should accidentally occur between the headand.the bore surfaces, provides a substantial volume of air againstwhich suction forces would be applied, rather than a very small volume,thereby minimizing the possibility of substantial suction forcesresisting removal of the headed bit.

It has been determined that the oppositely acting friction padmeans maybe one, two, three or more in number and.that the friction pad means andstop members may desirably be integrally formed to provide theirrespective functions in concert.-

These and other features and advantages of this invention. will becomeapparent from the following description and appended drawings of which:

7 FIG. 1 is an exploded side elevational view of a hand fastener drivingtool of this invention;

FIG. 2 is a view, partially in section, of the assembled tool of FIG. 1;

FIG. 3 is a cross-sectional view of the torque magnifying handle. ofFIG. 1;

FIG. 4 is a viewtaken substantially along the line 4-4 of FIG. 3,showing, in dotted line, the general position of an assembled headedbit;

FIG. 5 is a view similar to FIG. 3, but rotated about its longitudinalaxis;

FIG. 6 is a cross-sectional view taken substantially along the line 6-6of FIG. 5;

FIG. 7 is a longitudinal cross-sectional view of a further torquemagnifying handle of this invention;

FIG. 8 is a view taken substantially along the line 8-8 of FIG. 7; and

FIG. 9 is a view similar to FIG. 2 showing an assembled hand fastenerdriving tool incorporating the handle of FIG. 7.

Referring now to the drawings, a torque magnifying fastener; drivingtool 10 of this invention comprises a torque magnifying handle 20 and aninterchangeable and removable. headed bit 30. Headed bit 30 comprises ahead 32 molded from a suitable plastic material, such as any butyratecommonly used for screwdriver heads and the like, and a metal bit 34.

The bit 34 comprises an elongate shank portion 36 and a fastenerengaging portion 38. In the embodiment specifically illustrated in FIG.1, the bit is illustrated as a screwdriver blade, although other bits,such as nut driver bits, cross head screwdriver bits, and bits of otherwell known types may be similarly embedded, in a conventional manner, inplastic heads 32. The portion of the bit shank 36 embedded in theplastic head 32 may be configured in any well known manner to key itagainst relative rotation within the head.

At the end remote from bit 34, head 32 provides a smooth and roundedhead end 40. Intermediate the head end 40 and the opposite end of thehead, a plurality of flats 42 are provided. In the embodimentillustrated, the flats 42 extend along a major portion of thelongitudinal extent of the head 32, and are six in number to define, intransverse cross-section, an equilateral hexagon, a regular polygon. Thehexagonal configuration of the head provides a convenient means forkeying the headed bits to the torque magnifying handle in the manner tobe described, thereby to prevent relative rotation between them.

The torque magnifying handle 20 may conveniently define an outer flutedlongitudinal surface which provides a plurality of flutes 50. Handle 20defines a longitudinally oriented aperture or bore 52 opening at one endof the handle, and provides a smooth nonperforated convex end 54 at theother end. Under some circumstances the end 54 engages the palm of auser. Its smooth configuration minimizes abrasion of the users palm.

As best seen in FIGS. 4 and 6, at one end a portion of the bore 52 isgenerally hexagonal in shape, each of the equilateral sides of thehexagon, for convenience, being designated as lands 56. Preferably, thelands are each equal in transverse dimension. Pairs of opposed lands 56are preferably spaced from each other a distance of not more than tenthousandths of an inch more than the spacing between confrontingparallel flats 42 on the headed bit 30. Also, the lands 56 preferablyincline very slightly inwardly from their'outermostedges at one endofthe bore 52 to their innermost edges intermediate the ends of bore 52.It will be apparent, therefore, that the lands and the flats are ofsubstantially the same size, but with the head defining a slightlysmaller hexagon. Therefore, upon insertion of the head into the bore,there is provided a very slight space between the lands and the flatswhich defines an air passage means 57 extending from the outermost endof the bore 52 to the innermost end of the bore 52, and between thehandle and the head.

Intermediate the ends of the .bore a pair of projecting head engagingmeans are provided. These opposed gripper pads 58 project inwardly froma pair of opposed lands and are spaced apart a distance substantiallyequal to the space between an opposed pair of flats. When the headed bitis inserted into the aperture, gripper pads 58 snugly and frictionallygrip the confronting pair of flats 42 thereby to retain the head, hencethe headed bit, in removably assembled engagement with the torquemagnifying handle. Except in the vicinity of the gripper pads, the veryslight spacing providing the air passage means 57 between the head andthe interior wall surface of the handle will be maintained, thereby toeliminate the suction effect normally encountered in tools of thischaracter wherein headed bits frequently sealingly engage the walls ofthe bore in the handle.

To assure easy removal of the headed bit from the handle, in the eventthat the head and handle should accidentally become sealingly engaged,an inner bore portion or suction relief chamber 60 is provided. Suctionrelief chamber 60 is of a relatively large volume, as compared to thevolume of the space which would be provided if the bore 52 terminated ina shape complementary to the rounded head end 40 as is a known practice.The larger volume, of course means that a lesser suction force will beencountered when the head is removed, than if the chamber was not thereand the bore simply ended in a shape generally complementary to the headend 40 of the'headecl bit 30.

To maintain communication between chamber 60 and the other end of thebore 52, a plurality of stops or spacers 62 are provided. These spacerswhich are generally dimple-like in configuration project from therounded or concave intermediate portion 64 of bore 52. Spacers 62prevent the seating of head end 40 against concave inner portion 64,thereby making it impossible for them to sealingly engage. This alsoprovides constant communication, to the extent that it may be necessary,between suction relief chamber 60 and theother end of bore 52. Spacers62, by eliminating such sealing engagement, also eliminate thepossibility of sweating or freezing of the plastic head end 40 to thehandle at the concave end portion 64. Spacers 62 and gripper pads 58cooperate to locate the headed bit relative to the bore.

Referring now to the embodiment illustrated in FIGS. 7 to 9, a furthertorque magnifying driving tool of this invention comprises a torquemagnifying handle 120. which is adapted to receive interchangeable andremovable headed bits, such as bits 30.

The outer end surface of the torque magnifying handle may define aplurality of flutes 150. Handle 120 defines a longitudinally orientedbore 152 opening at one end of the handle and provides a smoothnonperforated convex end 154 at its other end. The smooth endedconfiguration minimizes the potential of abrading a users hand.

One end of the bore 152 is generally hexagonal in shape, each of theequilateral sides of the hexagon being designated as lands 156. Pairs ofopposed lands 156 are preferably spaced from each other a distance ofnot more than about ten thousandths of an inch more than the spacingbetween the confronting parallel flats 42 of the headed bit 30. Lands156 preferably incline slightly in the manner described in connectionwith the inclination of lands 56. Because the dimensions of the bit headdefine a slightly smaller hexagon than those of the space defined by thelands 156, upon insertion of the head into the handle bore, a veryslight space is provided between the lands andthe flats to define an airpassage 157 extending from the outer end of the bore 152 to itsinnermost end, and between the handle and the head.

Intermediate the ends of the bore, means are provided between lands 156and flats 42 for providing gripping engagement between the handle andthe head. These means comprise three narrow gripper pads or elements158, each of which projects inwardly from a land toward a confrontingflat 42. The gripper elements 158 serve to provide oppositely actingcomponents of force and to snugly and frictionally grip the confrontingflats 42, thereby to retain the head, hence the headed bit is removablyassembled engagement with handle 120. The narrow gripper elementsenhance both gripping of the headed bit 30and its separation because ofthe more limited area of contacL'Except in the vicinity of the gripperelements, the very slight spacing between the handle and head will bemaintained, thereby to eliminate the suction force frequentlyencountered in tially less than the full circumferential extent of theinner surface of the handle.

To assure easy removal of the headed bit from the handle in the eventthat they become sealingly engaged accidentally, a portion of the boredesignated as suction relief chamber 160 is provided. Suction reliefchamber 160 is similar to chamber 60, and functions in the mannerdescribed in connection with the embodiment of FIGS. 1-6.

To maintain communication between chamber 160 and the remote end of thebore 152, abutment means are provided. The abutment means comprisesthree narrow stop means or spacer elements 162 which, in the embodimentof FIGS. 7 to 9 are integrally formed with gripper pads 158 ascontinuations thereof. Spacer elements 162 project sufficiently inwardlyfrom the concave intermediate portion 164 of bore 152 to prevent theseating of head end 30 against portion 164. That provides constantcommunication, to the extent that it may be necessary, between theoutside of the handle and the suction relief chamber 160. The abutmentmeans also serves to locate the headed bit 30 axially of the aperture orbore 152.

The minimal engagement of the handles and heads also markedly reducesmechanical binding forces encountered in known tools of this generalcharacter which result from imperfections in molding techniques. In suchcases high and low spots on the parts, when they are mated, causebinding, making it difficult and occasionally almost impossible toretract headed bits from handles.

It is thus apparent, that this invention provides highly desirable andhighly effective torque magnifying fastener driving tools in which alarge variety of headed bits may be removably attached to a torquemagnifying handle.

The foregoing specification and drawings will suggest still othervariations within the scope and purview of the invention to thoseskilled in the art. Accordingly the invention is to be limited only inaccordance with the claims.

What is claimed is:

1. A hand fastener driving tool comprising a headed bit comprising ametallic bit member projecting from a separate but integrated enlargedplastic head, an enlarged torque magnifying plastic handle defining ahead receiving aperture at one end and defining a smooth non-aperturedsurface at the other end, the inner surface of the handle defining saidaperture and the external surface of said'head being generallycomplementary in configuration and being proportioned and shaped toprevent relative rotation the'rebetween, and to provide an air passagetherebetween which extends from the exterior of said handle at said oneend to the inner end of said aperture, the inner surface of said handleproviding opposite acting projecting head means extending less than thefull circumferential extent of the inner surface of the handle forfrictionally engaging circumferentially spaced confronting surfaces ofsaid head for retaining said head in said aperture, whereby upon removalof said head from said aperture no suction force is created.

2. In the hand fastener driving too] of claim 1 in which said externalsurface of said head and said inner surface of said aperture defineregular polygonal elongate surfaces spaced slightly apart, and in whichsaid head engaging means project inwardly from opposed polygonalsurfaces of said handle into engagement with said head.

3. In the hand fastener driving tool of claim 1 in which the inner endof said aperture terminatesin a suction relief chamber defined by saidhandle in communication with the inner end of said aperture.

4. In the hand fastener driving tool of claim 1 in which the inner endof said aperture is generally complementary in configuration to the endof said head, the inner end of said aperture defining a plurality ofprojecting spacers engaging said head thereby to prevent sealing contactbetween said inner end of said aperture and the adjacent end of saidhead.

5. A torque magnifying plastic handle adapted to interchangeably receivea plurality of headed bits, said bits each comprising a metallic bitmember projecting from a separate but integrated enlarged plastic head,said handle defining a head receiving aperture at one end and a smoothnon-perforated opposite end, said aperture being defined by at leastfour elongated lands defining in transverse cross-section a regularpolygonal configuration, gripper pads projecting slightly inwardly fromat least two, but less than all, of said lands and being positioned toact oppositely to frictionally engage the circumferentially spacedenlarged head of a headed bit and to retain the head within saidaperture.

6. In the torque magnifying handle of claim 5, wherein at the inner endof said aperture a plurality of projecting spacers are provided forengagement with the innermost end of the head of a headed bit to spacesaid innermost end from said inner end.

7. In the torque magnifying handle of claim 5 in which said handledefines an enlarged suction relief chamber in communication with saidaperture.

8. In the torque magnifying handle of claim 7 wherein at the inner endof said aperture a plurality of projecting spacers are provided forengagement with the innermost end of a headed bit to space said innermost end from said inner end.

9. A hand fastener driving tool comprising an enlarged torque magnifyingplastic handle defining a head receiving aperture at one end anddefining a smooth nonapertured surface at the other end, said handlehaving an internal surface defining a bore in communication with saidaperture, stop means on the inner surface of the handle intermediate theends of said bore to provide an abutment against which a headed bit isseated, a headed bit inserted in said bore through said aperture, saidheaded bit comprising a metal bit member projecting from a separate butintegrated enlarged plastic head, said head being seated against saidstop means to locate said bit axially relative to said bore, cooperatingmeans on the inner surface of the handle and the external surface of thehead for preventing said bit from rotating relative to said handle, andmeans on the inner surface of said bore and the external surface of saidhead for providing gripping engagement between said inner surface andsaid head, said last named means extending less than vthe fullcircumferential extent of the inner surface of said handle thereby toprovide communication between the portion of the bore inwardly of thestop means and the portion of the bore outwardly of the stop means whenthe head is seated against the stop means, whereby upon removal of saidhead from said bore no suction force is created.

10. A hand fastener driving tool in accordance with claim 9 wherein saidmeans for providing gripping engagement comprises gripper elementsprojecting inwardly from the inner surface of the'handle.

11. A hand fastener driving tool in accordance with claim 10 whereinsaid gripper elements are at least two in number and act with componentsof force oppositely of each other to grippingly engage said head.

12. A hand fastener driving tool in accordance with claim 10 whereinsaid stop means and said gripper elements are formed integrally.

13. A hand fastener driving tool comprising an enlarged torquemagnifying plastic handle defining a head receiving aperture at one endand defining a smooth nonapertured surface at the other end, said handlehaving an internal surface defining an elongate bore in communicationwith said aperture, stop means on the inner surface of the handleintermediate the ends of said bore to provide an abutment against whicha headed bit is seated, a headed bit inserted in said bore through saidaperture with one end of said headed bit being seated against said stopmeans to locate said bit axially relative to said bore and being spacedsubstantially away from the innermost end of said bore, said headed bitcomprising an enlarged plastic head and a metal bit member projectingoutwardly of said handle, the external surface of said head and theconfronting inner surface of said handle being generally complementaryin configuration, thereby to prevent relative rotation therebetween, theinner surface of said handle providing at least two friction members forfrictionally engaging confronting surfaces of said head for retainingsaid head in said aperture, said friction members extending less thanthe full circumferential extent of the inner surface of said handle, toprovide an air passage between confronting surfaces of said head andhandle and to provide communication with the inner end of said bore sothat, upon removal of said head from said bore, no suction forces arecreated.

14. A hand fastener driving tool in accordance with claim 13 whereinsaid friction members are narrow, are at least three in number and areintegrally formed with said stop means.

UNITED STATES PATENT OFFICE. CERTIFICATE GI -CORRECTION Patent No.3,752,202 Dzited August 1 .1973

Inventor(s) Harry F. Condon It 1e certified that error appears in theabove identified patent and that seid Letters Patent are herebycorrected asv shown below:

In the Abstract, line 3 of text "recieve" should be receive --5 Column5, line 61 (CLAIM 1), before "means" insert engaging Signed and sealedthis 20th day of November 1973.

(SEAL) Attest:

EDWARD VLFLETCEERJR RENE D TEGTMEYER Attesting Officer ActingCommissioner of Patents

1. A hand fastener driving tool comprising a headed bit comprising ametallic bit member projecting from a separate but integrated enlargedplastic head, an enlarged torque magnifying plastic handle defining ahead receiving aperture at one end and defining a smooth non-aperturedsurface at the other end, the inner surface of the handle defining saidaperture and the external surface of said head being generallycomplementary in configuration and being proportioned and shaped toprevent relative rotation therebetween, and to provide an air passagetherebetween which extends from the exterior of said handle at said oneend to the inner end of said aperture, the inner surface of said handleproviding opposite acting projecting head means extending less than thefull circumferential extent of the inner surface of the handle forfrictionally engaging circumferentially spaced confronting surfaces ofsaid head for retaining said head in said aperture, whereby upon removalof said head from said aperture no suction force is created.
 2. In thehand fastener driving tool of claim 1 in which said external surface ofsaid head and said inner surface of said aperture define regularpolygonal elongate surfaces spaced slightly apart, and in which saidhead engaging means project inwardly from opposed polygonal surfaces ofsaid handle into engagement with said head.
 3. In the hand fastenerdriving tool of claim 1 in which the inner end of said apertureterminates in a suction relief chamber defined by said handle incommunication with the inner end of said aperture.
 4. In the handfastener driving tool of claim 1 in which the inner end of said apertureis generally complementary in configuration to the end of said head, theinner end of said aperture defining a plurality of projecting spacersengaging said head thereby to prevent sealing contact between said innerend of said aperture and the adjacent end of said head.
 5. A torquemagnifying plastic handle adapted to interchangeably receive a pluralityof headed bits, said bits each comprising a metallic bit memberprojecting from a separate but integrated enlarged plastic head, saidhandle defining a head receiving aperture at one end and a smoothnon-perforated opposite end, said aperture being defined by at leastfour elongated lands defining in transverse cross-section a regularpolygonal configuration, gripper pads projecting slightly inwardly fromat least two, but less than all, of said lands and being positioned toact oppositely to frictionally engage the circumferentially spacedenlarged head of a headed bit and to retain the head within saidaperture.
 6. In the torque magnifying handle of claim 5, wherein at theinner end of said aperture a plurality of projecting spacers areprovided for engagement with the innermost end of the head of a headedbit to space said innermost end from said inner end.
 7. In the torquemagnifying handle of claim 5 in which said handle defines an enlargedsuction relief chamber in communication with said aperture.
 8. In thetorque maGnifying handle of claim 7 wherein at the inner end of saidaperture a plurality of projecting spacers are provided for engagementwith the innermost end of a headed bit to space said inner most end fromsaid inner end.
 9. A hand fastener driving tool comprising an enlargedtorque magnifying plastic handle defining a head receiving aperture atone end and defining a smooth nonapertured surface at the other end,said handle having an internal surface defining a bore in communicationwith said aperture, stop means on the inner surface of the handleintermediate the ends of said bore to provide an abutment against whicha headed bit is seated, a headed bit inserted in said bore through saidaperture, said headed bit comprising a metal bit member projecting froma separate but integrated enlarged plastic head, said head being seatedagainst said stop means to locate said bit axially relative to saidbore, cooperating means on the inner surface of the handle and theexternal surface of the head for preventing said bit from rotatingrelative to said handle, and means on the inner surface of said bore andthe external surface of said head for providing gripping engagementbetween said inner surface and said head, said last named meansextending less than the full circumferential extent of the inner surfaceof said handle thereby to provide communication between the portion ofthe bore inwardly of the stop means and the portion of the boreoutwardly of the stop means when the head is seated against the stopmeans, whereby upon removal of said head from said bore no suction forceis created.
 10. A hand fastener driving tool in accordance with claim 9wherein said means for providing gripping engagement comprises gripperelements projecting inwardly from the inner surface of the handle.
 11. Ahand fastener driving tool in accordance with claim 10 wherein saidgripper elements are at least two in number and act with components offorce oppositely of each other to grippingly engage said head.
 12. Ahand fastener driving tool in accordance with claim 10 wherein said stopmeans and said gripper elements are formed integrally.
 13. A handfastener driving tool comprising an enlarged torque magnifying plastichandle defining a head receiving aperture at one end and defining asmooth nonapertured surface at the other end, said handle having aninternal surface defining an elongate bore in communication with saidaperture, stop means on the inner surface of the handle intermediate theends of said bore to provide an abutment against which a headed bit isseated, a headed bit inserted in said bore through said aperture withone end of said headed bit being seated against said stop means tolocate said bit axially relative to said bore and being spacedsubstantially away from the innermost end of said bore, said headed bitcomprising an enlarged plastic head and a metal bit member projectingoutwardly of said handle, the external surface of said head and theconfronting inner surface of said handle being generally complementaryin configuration, thereby to prevent relative rotation therebetween, theinner surface of said handle providing at least two friction members forfrictionally engaging confronting surfaces of said head for retainingsaid head in said aperture, said friction members extending less thanthe full circumferential extent of the inner surface of said handle, toprovide an air passage between confronting surfaces of said head andhandle and to provide communication with the inner end of said bore sothat, upon removal of said head from said bore, no suction forces arecreated.
 14. A hand fastener driving tool in accordance with claim 13wherein said friction members are narrow, are at least three in numberand are integrally formed with said stop means.